ORA-02303：cannot drop or replace a type with type or table dependents
错误码
错误描述：cannot drop or replace a type with type or table dependents
错误原因：An attempt was made to drop or replace a type that has type or table dependents.
解决方法：For DROP TYPE, drop all type(s) and table(s) depending on the type and then retry the operation, or use the FORCE option. For CREATE TYPE, drop all type(s) and table(s) depending on the type and then retry the operation, or drop all table(s) depending on the type and retry with the FORCE option.
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